The fundamental and the electric capability of ac-servo system were analyzed; meanwhile, the main performance evaluation index and test methods of AC servo system were introduced. Accordingly, according to the requirements and characteristics of the AC servo system test in GB/T 16439-2009 “General specification for AC servo system”, a test platform for AC servo system testing was developed, and the methods of AC servo system with the platform were introduced. The design of the test system provides an important reference for the development of similar test stations.